Configure Identity Provider

Enter values for the name and type attributes. The value of the name attribute must be unique for each entry. The type must be Sitecore.Owin.Authentication.Collections.IdentityProvidersPerSitesMapEntry, Sitecore.Owin.Authentication, or inherit from this.

Applying builder to site

Find mapEntry within the identityProvidersPerSites node of the site that you are going to define a user builder for, and specify the externalUserBuilder node. For example:

In Sitecore 9.2, the parameter less constructor is removed from IdentityProvidersPerSitesMapEntry class. There is only one parameterized constructor and this attribute will resolve the parameters by DI when this class object is initialized.

Also, you will need to add the same attribute in all externalUserBuilder nodes as well (if there are any)